Boiler-tube connection.



C. S. COLEMAN.

Bouin TUBE CONNECHON.

APPLICATION HLED APR. I4. i917 l gj, U j@ f5 y mi Ly A TTORNE Y.

i eeaeee CHARLES S. COLEMAN, 0F LGS ANGELES, GALXFORNIA, RBSGNQF.

NO-LEAK BOILER TUBE COMPANY. 0F LOS ANGELES, UiLERifil, il CQRLF/A.

OF CALIFORNIA.

Application filed April lll, 1917.

To all whom 'it may concern.'

Y, Beit known thatl? (nAnLrnS. Comming a citizen lof the United States, residing at Los Angeles, inthe county ot' Loa ngeles and State of California, have invented a new and useful Boiler-Tube Coiinectioinor which the following is a specification.

This invent-ion :relates to a boiler tube connection and particularly pertains to a means and method of attaching the end oi a boiler tube to the fire box end plate of the boiler by a weld joint.

lt is the object of this invention to proV ride a means and method for welding` boiler tubes to the boiler end plate to forni a sealed joint and one which is not liable to be separated by exipansion and contraction of the tube end plate and thus provide a construetion by which a non-leakable joint will be obtained. j v

Another object is to provide a weld joint ,lor boiler tube end connections whiclrwill permit ot' the tube being' disconnected -from the end plate without damaging' either the tube or the plate so that the tube maf,7 be

replaced and rewelded to the end plate.

Other objects will appear hereinafter.

The invention is illustrated in the accompanying' drawings, in which:

Figure l is a view in Vertical section :showing the boiler tube as connected to the boiler plate and illustrating one embodiment of my invention.

Fig. 2 is a View in elevation as eeen in 'the direction indicated by the arrow 2 in Fig: 1. i

Figs. 3, 4, 5 and G are-views illustrating1 modified forms of the invention.

More specifically 'lindcates the boiler tube and 8 the boiler end plate. ln carryiing` out the invention the boiler uloe is fitted with anv end section 9zhaving an outside diameter corresponding to that of the tube and with a wall thickness subetzuitialljY twice the thickness of the tube wall. The tube end connected to the tube by forming the tube end with a reduced outside diameter l() which is inserted within the tube and the joint thus forn'ied welded together, as more particularly set forth in my oo-pending ai plication beariner Serial Number l, filed February l2, 1917.

The outer end of the section. fl is reduced in diameter to orm a shoulder 1l, and a reduced end portion l2 of a lengtlisubst-an- We r We" te e: on. .nul-Leimen Idepth slightly ,greater BOLER-TUBE CGNNECTGN.

Specification of Letters Patent.

Serial Kilo.

te the izliiclness ef the boiler end pla-te. end play e is formed vill an openingA to receive the portion l2 which is inserted into the boiler plate from ihe rear thereof. The outer face of the 6e boiler plate is formed with an annular channel i3 around the marginal edge of the boiler tube opening', having; a. width and than the thickness of the wall of the portion This channel is designed toI receive an a-nnulus of metal. ll of va degree of lusibility or .hardness 'lightly than that of the niet-al of which he tube section il and elid. plate are formed. ln aiseemblingg the connection the reduced portion if? ie .inserted in the opening' in the end plate with *he shoulder ll tightly abut tine` against llie inner ilace'ol the end plate. 'The portion then rolled t-igl'it against the wall olf the opening whereupon the metal 3T is welded in the channel 13 and to the portion 12 thus eli'ectiveljf joining; the tube eer-,tion 9 to the end plate. TWhen thus connected., the endi of the tube section may tend flush with' the lire face of 'the boiler end plate thus forming; the atter free from prejectionsB By forming' the Ine-tal lil. lusibilitj7 or hardness lese elian that of its surrounding; metal it ma;v be removed by a suitable cutting' tool Without injuring either the end plate or the tube section. so tliat the latter may be removed and replaced as oocaeion may require.

The joint thus formed provides the advantage derived by a. weld joint with this adde l -feature oit' perinitting'the removal and replacement of the boiler tube whieh van not be ei'iiected where nthe tube end. eee tion is welded to the end plate throughout 95 the .thickness nl the latter or beaded over the outer tace of the end plate with the bead welded to the latter.

ln the 'forni of the invention Slrowr.. in Fig". 3 a copper gasket lo' is interposed between lluportion li', shoulder lll and 'the end piate Fig. :l shows the shoulder ll as coun er- .suoli in the end plate and the gasket lJ y cenled. M

Fig. 'l a, coneruction eulrtantially i foi-respon(ling;n te r g. with the 'einion that the. shoulder il is couille" o the inner face of' the end p te.

ln Sonie ii'ietencee iu may be desirable to tiallv corres rondin fr in with a degree of bevel the openingv in the end plate outwardly as shown in Fig. .G in which ease the port-ion 1;! will be rolled to conform to the bevel thusI formed.

,Various other modifications of the invention may be resorted to as occasion may require without departing from the spirit. and scope of the invention as set forth in the appended claims` and the essence ot which resides in welding a metallic -annulusI to the tube end and the boiler end plate.

I claim:

l. A boiler tube and end plate connection comprising an end section of an outside -diarneter equal that of a boiler vtube and thickness greater than that of the tube. said end section having reduced ends forming; flat annular shoulders, a boiler tube within which one end of the end sect-ion is inserted, a boiler end plate having an opening.,r in which the other reduced end lportion of the end section is inserted with the shoulder abutting throughout its surface against the end plate, and an annulus of nieta] welded to the 2 5.

outer end of the end swtion and to the boiler end plate,v.said annulus arranged in a channel in the outer face of the end plate and cooperating with the shoulder abutting,r against the opposite side ot' the end plaie to hold the end section against displacement and eti'ect a tightjoint. l l

2. A 'boiler tube and end platerconnection comprising an end section of an outside di aineter equal that of a boiler tube and havingr a wall thickness greater than that- 0f the tube. said end section having reduced ends formingr iiat annular shoulders, a boiler tube within which one end ot' the end sec tion is inserted, a boiler end plate having;r an openingr in which the other reduced end portion of the end] section isinserted with -the shoulder abuttin, r througho'it its surfaeeagainst the end plate, a nietallie gasket interposed in the joint between the' end secl tion and the wall of t'he opening in. theI boiler end plate, and an annulus of nietal welded to the outer end of the end section and to the boiler end plate, said annulus arranged in a channel in the outer. face otl the end plate and coperatingr with the shoulder abutting against the opposite side of the end plate to hold the end sect-ion aga-inst displacement and effect. a tight Joint.

CHARLES S. COLEMAN. 

